When San Francisco officials approved the installation of separated bikeways along Fell and Oak Streets, local bike enthusiasts rejoiced.

Regular cyclists have long complained that the highly-trafficked stretch of the two parallel streets, which connects the popular Wiggle bicycle route to Golden Gate Park, are unsafe.

But now their celebrated plan might be threatened.

Earlier this month, a group of neighborhood residents appealed the city's approval of the bikeway, arguing it violates both the Americans with Disabilities Act and the California Environmental Quality Act.

In a complaint filed on November 5 with the city's Planning Department and Board of Supervisors, developer Mark Brennan, disability rights advocate Howard Chabner and Haight Ashbury Improvement Association President Ted Loewenberg charge that the bikeway project is illegal...